ジ－2－エチルヘキシル－リン酸による塩酸溶液からの液－液抽出

抄録

The extraction of molybdenum (VI) from hydrochloric acid solutions by di-(2-ethylhexyl)-phosphoric acid (DEHPA, HX) in kerosene and benzene has been investigated under different conditions. The infrared, nuclear magnetic resonance and electronic absorption spectra measurements were made of the organic extracts. As the results, it is found that the extraction of molybdenum(VI) at low aqueous acidity ([HC1] ≤ 3 mol dm^-3) is governed by a cation-exchange reaction and at higher acidity ([HC1] ≥ 3 mol dm^-3) by a solvating reaction : at low acidity, MoO₂²⁺(aq) + 2(HX)₂(org)↔MoO₂X₄H₂(org) + 2H⁺ (aq) ; at higher acidity, MoO₂Cl₂(aq) + (HX)₂(org)↔MoO₂Cl₂·2HX(org). Accordingly the monomeric complexes MoO₂X₄H₂ and MoO₂Cl₂·2HX, indicating the coordination number of six for molybdenum as the octahedral structure, are formed in the extraction from aqueous solutions at low and higher acidities, respectively.